<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        padding: 0;
        margin: 0;
      }
      #left {
        width: 200px;
        height: 200px;
        background-color: #cfa;
        float: left;
      }
      #right {
        width: 200px;
        height: 200px;
        background-color: #666;
        float: right;
      }
    </style>
  </head>
  <body>
    <div id="left">左青龙</div>
    <div id="right">右白虎</div>
  </body>
</html>
